Step-bearing.



W. H. LAWSON.

STEP BEARNG.

APPLICATION FILED'DEG-15, 1909.

NVENTOI? By l www f ATTO/nvm;r

Patented Dec. 26, 1911.

W/T/VESSES WELCOME H. LAWSON, OF POUGHKEEPSIE, NEW YORK.

STEP-BEARING.

Leiacce.

i Specification of Letters Patent.

Application filed December 15 1909.

Patented Dec. 26, 1911.

Serial No. 533,129.

To all whom it may; concern:

Be it known that l, Tramonti ll. LwsoN, a citizen of the United States, and a resident of Poughkeepsie, in the county of Dutchess and State of New York, have invented certain new and useful Improven'ients in Step-Bearings, of which the following is aspecification.

My `'invention relates to step bearings and is particularly designed for use with machines of high speed.

rifhe object of my invention is to provide a bearing in which theparts in contact may he quicklyu and cheaply renewed, in which the parts may be hardened at a low cost and in which the surfaces in contact may be lubricated in a simple and efficient manner.

Referring to the drawings which form a part of this'specifcation, Figure l is avertical sectional view through a part of the frame of a. machine and through my improved 'bearing which is located therein. Fig. 2 is a similar view showing the elementsof the bearings in reversed position.

A, indicates the lower end of the frame of a machine' such for 'illustration as a milk separator and is provided with a threaded opening A2 in which is fitted and secured screw B, the upper end of which is recessed to form a cone shaped bearing surface E.

Referring to Fig. 1, F indicates a bearing element which is held by friction in the recess B and is provided with a conical top portion which serves as the bearing surface for ythe'lower end ofthe shaft C.

D indicates the bearing element whichr is fitted in a cone shaped recess C in the lower end of shaft C and the outer surface of which is of the ysame formation and dimension thev outer surface of the element F so that the element D and element F are interchangeable relative to the shaft C and screw B. l

The element D is provided'with a central recess in which is located a lubricating metal such as metallic lead, or graphite might be used if preferred.

vtir indicates a chamber located in the lower end of the machine and H indicates oil therein for lubricating the surfaces of the bearing elements.

ln operation, in case the surfaces of the hearing elements should run dry and friction should cause the said elements to heat, the metal E having a greater coefficient of expansion than the metal which holdsit, will expand sufficiently to permit oil to flow between the surfaces of the bearing to effect a renewal of the lubrication. T he spindles or shafts of the machine of the character referred to run at a very high speed usually six to eight thousand revolutions per mir.- ute and in practice these shafts lift from their bearing silrfacies quite frequently which permits the oil to flow freely between the surfaces of the bearings, but cases have occurred where, due to the high speed ofv the shaft, the oil has been unable to flow between the surfaces and the bearings would heat. In this case the metal E has been found to expand sufliciently to raise the shaft C far enough fromethe bearing surface to permit the oil tto/flow between the bearing surfaces to effect lubrication.

I claim:

l. A machine having an oil chamber, a screw having a removable bearing element located in one end thereof, `a shaft .having a removable'bearing element located in one end thereof, and in VContact with said first named bearing element, one of said elements having a recess therein and a metallic lubricating material located in said recess, for the purpose set forth.

2. A step bearing comprising a screw having a recess in one end thereof, abearing element located "in said recess, a shaft having a recess similar in form to the recess in said screw, a bearing element located in said recess and in direct contact with said first bearing element, oney of said bearing elements having a recess in which is located a lubricant such as soft metal or graphite having a greater co-eficientof expansion than that of said elements.

3. A step bearing comprising a screw having a recess in one end thereof, a bear= ing element located in said recess, a shaft having a recess similar in form to the recess in said screw, a bearing element located in said recess and in direct Contact with said first hearing element, one of said bearing elements having a recess in which is located a metal having a greater co-eificieht of expansion than that of said elements.

4. A step bearing comprising two bearing elements iu direct contact, ene of which'-A provided with a central recessin which is located a piece of lubricating material having a greater co-eflicient of expansion than ing a recess in which is located a piece of expansible material having a eater co- 10 lefficient of expansion than that o Said bearing elements, and in Contact with said ele-` ments, for the purpose set forth. g if. Signed at New York city,` in the eountytg.)` 1' of New York and State of New York, this filf 10th day of December, A. D. 1909. 11m

' vWELCOME H. LAWSON. u

Witnesses:

FRANK M. ASHLEY, MINNIE S. MILLER. 

